US8456967B1 - Systems and methods for providing a pole pedestal for microwave assisted magnetic recording - Google Patents

Systems and methods for providing a pole pedestal for microwave assisted magnetic recording Download PDF

Info

Publication number
US8456967B1
US8456967B1 US13/271,555 US201113271555A US8456967B1 US 8456967 B1 US8456967 B1 US 8456967B1 US 201113271555 A US201113271555 A US 201113271555A US 8456967 B1 US8456967 B1 US 8456967B1
Authority
US
United States
Prior art keywords
pole
parallel side
transducer
comprises
trailing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US13/271,555
Inventor
Michael L. Mallary
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Digital Fremont LLC
Original Assignee
Western Digital Fremont LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Western Digital Fremont LLC filed Critical Western Digital Fremont LLC
Priority to US13/271,555 priority Critical patent/US8456967B1/en
Assigned to WESTERN DIGITAL (FREMONT), LLC reassignment WESTERN DIGITAL (FREMONT), LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MALLARY, MICHAEL L.
Application granted granted Critical
Publication of US8456967B1 publication Critical patent/US8456967B1/en
Assigned to JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT reassignment JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: WESTERN DIGITAL (FREMONT), LLC
Assigned to U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT reassignment U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: WESTERN DIGITAL (FREMONT), LLC
Assigned to JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT reassignment JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: WESTERN DIGITAL (FREMONT), LLC
Assigned to WESTERN DIGITAL (FREMONT), LLC reassignment WESTERN DIGITAL (FREMONT), LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Application status is Active legal-status Critical
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/1278Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/187Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/23Gap features
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/31Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109Details
    • G11B5/3116Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/31Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109Details
    • G11B5/313Disposition of layers
    • G11B5/3143Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
    • G11B5/3146Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002Special dispositions or recording techniques
    • G11B2005/0005Arrangements, methods or circuits
    • G11B2005/0024Microwave assisted recording

Abstract

Systems and methods for providing a write pole pedestal for microwave assisted magnetic recording systems are provided. One such system includes a magnetic transducer for microwave assisted magnetic recording, the magnetic transducer including a pole including a leading edge and a trailing edge, a trailing shield positioned closer to the pole trailing edge than the pole leading edge, and an energy transducer positioned between the pole trailing edge and the trailing shield, where a trailing parallel side of the trapezoid is smaller than a leading parallel side of the trapezoid.

Description

FIELD

The present invention relates generally to microwave assisted magnetic recording, and more specifically, to systems and methods for providing a write pole pedestal for microwave assisted magnetic recording systems.

BACKGROUND

Bit Patterned Media (BPM) and Energy Assisted Magnetic Recording (EAMR) are the primary technologies that are being investigated to overcome the Super Paramagnetic Limit (SPL) of perpendicular magnetic recording (PMR). While BPM awaits a fabrication technology that achieves performance at low cost, EAMR is struggling with media performance and head reliability. Therefore, the dark horse approach, microwave assisted magnetic recording (MAMR), is looking attractive to achieve gains of up to twice conventional levels in areal density (AD) with minimal changes in the associated heads and media.

MAMR approaches often include improved spin torque oscillators (e.g., such as those described in U.S. Pat. No. 7,616,412) that appear to show great promise for gains in areal density. However, as the component geometries are shrunk to achieve the gains in areal density, problems such as adjacent track interference (ATI) can become prevalent. As such, an improved MAMR system that reduces adjacent track interference (ATI) is needed.

SUMMARY

Aspects of the invention relate to systems and methods for providing a write pole pedestal for microwave assisted magnetic recording systems. In one embodiment, the invention relates to a magnetic transducer for microwave assisted magnetic recording, the magnetic transducer including a pole including a leading edge and a trailing edge, a trailing shield positioned closer to the pole trailing edge than the pole leading edge, and an energy transducer positioned between the pole trailing edge and the trailing shield, wherein a shape of the pole at the trailing edge comprises a trapezoid, where a trailing parallel side of the trapezoid is smaller than a leading parallel side of the trapezoid.

In another embodiment, the invention relates to a method for fabricating a magnetic transducer for microwave assisted magnetic recording, the method including depositing a ferromagnetic material for a pole, planarizing the pole material and thereby forming a pole having a leading edge and a trailing edge, depositing one or more materials on the planarized pole material to form an energy transducer, shaping the energy transducer materials such that the energy transducer includes a preselected shape, and shaping the pole materials such that the pole air bearing surface includes a trapezoidal shape at the trailing edge.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a microwave assisted magnetic recording system including a magnetic transducer having a pole pedestal, a spin torque oscillator and trailing shield positioned above a magnetic media in accordance with one embodiment of the invention.

FIG. 2 is a view from the air bearing surface (ABS) of the magnetic transducer of FIG. 1 illustrating the shapes of the pole pedestal, the spin torque oscillator and the trailing shield as viewed from the ABS in accordance with one embodiment of the invention.

FIGS. 3 a to 3 h illustrate a sequence of side views of a magnetic transducer workpiece and corresponding processing actions illustrating a process for forming the magnetic transducer including a pole pedestal in accordance with one embodiment of the invention.

DETAILED DESCRIPTION

Referring now to the drawings, embodiments of magnetic transducers having write pole pedestals and processes for forming the write pole pedestals are illustrated. The write pole pedestals are protrusions of the write poles for the magnetic transducers. The magnetic transducers with write pole pedestals can be used in microwave assisted magnetic recording (MAMR) or other suitable systems. In several embodiments, the write pole pedestals have a trapezoidal shape and are positioned between a trailing edge of the write pole and an energy transducer such as a spin torque oscillator. The write pole pedestals can enhance the on track field produced by the write pole while reducing the off track field, thereby preventing or reducing adjacent track interference. As a result, the recording media can have more closely spaced tracks than conventional systems, and thus greater storage capability. Processes for forming the write pole pedestals can involve relatively minor modifications to processes for forming magnetic transducers for microwave assisted magnetic recording. For example, in several embodiments, the processes can be modified to extend the reactive ion etching time of the process step for shaping the energy transducer, thereby shaping both the energy transducer and the write pole.

FIG. 1 is a side view of a microwave assisted magnetic recording (MAMR) system 100 including a magnetic transducer 102 having a write pole 104 with a pole pedestal 104 a, a spin torque oscillator 106, and a trailing shield 108 positioned above a magnetic recording media 110 in accordance with one embodiment of the invention. The MAMR system can be used to magnetically read and write information on the magnetic media 110 using high frequency microwave signals.

The recording media 110 includes one or more top layers 112 (e.g., hard magnetic layer) formed of one or more hard magnetic materials, and one or more bottom layers 114 (e.g., soft under layer) formed of one or more soft magnetic materials. In operation, the write pole 104 and spin torque oscillator 106 can generate and direct a high-frequency magnetic field to a microscopic region of the recording media 110 to write magnetic information to, or to read information from, the media 110.

FIG. 2 is a view from the air bearing surface (ABS) of the magnetic transducer 102 of FIG. 1 illustrating the pole pedestal shape 104 a of the write pole 104, the spin torque oscillator (STO) 106 and the trailing shield 108 as viewed from the ABS in accordance with one embodiment of the invention. The write pole 104 has a substantially rectangular shape which includes a leading edge 116 and a trailing edge 118. The pole pedestal 104 a forms an isosceles trapezoid 104 a with a long base (e.g., leading parallel side of the trapezoid) positioned along the trailing edge 118 and a short base (e.g., trailing parallel side of the trapezoid) in contact with the spin torque oscillator 106. The magnetic transducer 102 also includes a first encapsulant layer 107 positioned along sides of the write pole 104 and a second encapsulant layer 109 positioned between the trailing write shield 108 and the write pole 104.

In several embodiments, the pole pedestal shape of the write pole 104 can enable concentration of the write pole flux under the STO thus producing a better write process for higher coercivity finer grain media. In addition, the pole pedestal shape of the write pole can provide a reduction in the off track pole field thereby minimizing adjacent track interference (ATI). In some embodiments, the STO can be replaced by another energy transducer such as a near field optical transducer or a waveguide.

In several embodiments, the isosceles trapezoid shaped pole pedestal 104 a can have a base angle of about 40 to about 80 degrees, where the base angle is measured relative to the long base (e.g., leading parallel side) of the isosceles trapezoid which has a length greater than that of the short base (e.g., trailing parallel side) of the isosceles trapezoid. In one such embodiment, the base angle is about 60 degrees.

FIGS. 3 a to 3 g illustrate a sequence of side views of a magnetic transducer workpiece and corresponding processing actions illustrating a process 250 for forming the magnetic transducer including a pole pedestal in accordance with one embodiment of the invention. In particular embodiments, the process 250 can be used to form the magnetic transducer of FIGS. 1 and 2. As illustrated in FIG. 3 a, the process first deposits and shapes (252) materials for a write pole and an encapsulant 207. The process can first deposit ferromagnetic material 204-1 and shape it using masked ion milling to form the write pole. The shaped write pole can then be encapsulated by sputter depositing the encapsulant 207 consisting of a ceramic material such as aluminum oxide or another suitable material. In several embodiments, the pole 204-1 has a substantially rectangular shape. As illustrated in FIG. 3 b, the process then planarizes (254) the encapsulant 207 and the pole material 204-1 to form the write pole 204-1 which has a leading edge 216 and a trailing edge 218.

As illustrated in FIG. 3 c, the process deposits (256) one or more materials 206-1 on the planarized pole material 204-1 to form an energy transducer. In several embodiments, the energy transducer can be a spin torque oscillator. As illustrated in FIG. 3 d, the process then shapes (258) the energy transducer materials 206-1 such that the energy transducer has a preselected shape 206-2. In several embodiments, the energy transducer materials 206-1 are shaped by depositing a mask 205 on preselected portions of the energy transducer materials and then removing portions of the energy transducer materials not protected by the mask. In one embodiment, removing the portions of the energy transducer materials not protected by the mask includes performing ion milling on the portions of the energy transducer materials not protected by the mask.

As illustrated in FIG. 3 e, the process then shapes (260) the pole materials 204-1 such that the resulting write pole 204-2 has a trapezoidal shape 204-2 a at the trailing edge 218 of the write pole 204-2. In several embodiments, the process shapes the pole materials by removing portions of the pole materials at a preselected angle. In one such embodiment, the removing portions of the pole materials at the preselected angle includes performing an etching process on the portions of the pole material at the preselected angle. The etching process can be an ion milling process and/or a reactive ion etching process. In several embodiments, the removing portions of the pole materials at the preselected angle includes rotating the pole material during the etching process, particularly during an ion milling type process. In such case, the workpiece including the write pole 204-2, the energy transducer 206-2, and mask 205 can be rotated while incident ions etch the energy transducer 206-2 and the write pole 204-2 at a preselected angle. In several embodiments, the preselected angle is determined based on a preferred angle of the trapezoid side walls of the pole pedestal 204-2 a. In several embodiments, the main portion of the pole 204-2 continues to have a substantially rectangular shape.

As illustrated in FIG. 3 f, the process then removes (262) the mask 205 and deposits a second encapsulant 209 (e.g., a ceramic gap layer) on the workpiece. As illustrated in FIG. 3 g, the process then planarizes (264) the second encapsulant 209. As illustrated in FIG. 3 h, the process then deposits (266) and shapes the trailing write shield 208.

In the embodiments illustrated in FIG. 2 and FIG. 3, the write pole and the write pole pedestal have particular preselected shapes. In other embodiments, the write pole and the write pole pedestal can have other preselected shapes.

In one embodiment, the process can perform the sequence of actions in a different order. In another embodiment, the process can skip one or more of the actions. In other embodiments, one or more of the actions are performed simultaneously. In some embodiments, additional actions can be performed.

While the above description contains many specific embodiments of the invention, these should not be construed as limitations on the scope of the invention, but rather as examples of specific embodiments thereof. Accordingly, the scope of the invention should be determined not by the embodiments illustrated, but by the appended claims and their equivalents.

Claims (23)

What is claimed is:
1. A magnetic transducer for microwave assisted magnetic recording, the magnetic transducer comprising:
a pole comprising a leading edge and a trailing edge;
a trailing shield positioned closer to the pole trailing edge than the pole leading edge; and
an energy transducer positioned between the pole trailing edge and the trailing shield,
wherein a shape of the pole at the trailing edge comprises a trapezoid, wherein a trailing parallel side of the trapezoid is smaller than a leading parallel side of the trapezoid.
2. The magnetic transducer of claim 1, wherein the leading parallel side of the trapezoid is about collinear with the pole trailing edge.
3. The magnetic transducer of claim 1, wherein a shape of the pole at the trailing edge comprises an isosceles trapezoid.
4. The magnetic transducer of claim 3, wherein the energy transducer is closer to the trailing parallel side than the leading parallel side.
5. The magnetic transducer of claim 4, wherein the energy transducer abuts the trailing parallel side.
6. The magnetic transducer of claim 1, wherein a shape of the pole at the trailing edge comprises an isosceles trapezoid having a base angle of about 40 to about 80 degrees, wherein the base angle is relative to the leading parallel side of the trapezoid.
7. The magnetic transducer of claim 1, wherein a shape of the pole air bearing surface at the trailing edge comprises an isosceles trapezoid having a base angle of about 60 degrees, wherein the base angle is relative to the leading parallel side of the trapezoid.
8. The magnetic transducer of claim 1, wherein the energy transducer comprises a spin torque oscillator.
9. The magnetic transducer of claim 1, wherein the energy transducer comprises a component selected from the group consisting of a near field optical transducer and a waveguide.
10. A method for fabricating a magnetic transducer for microwave assisted magnetic recording, the method comprising:
depositing a ferromagnetic material for a pole;
planarizing the pole material and thereby forming a pole having a leading edge and a trailing edge;
depositing one or more materials on the planarized pole material to form an energy transducer;
shaping the energy transducer materials such that the energy transducer comprises a preselected shape; and
shaping the pole materials such that the pole air bearing surface comprises a trapezoidal shape at the trailing edge.
11. The method of claim 10, wherein the shaping of the energy transducer materials comprises:
depositing a mask on preselected portions of the energy transducer materials; and
removing a portion of the energy transducer materials not protected by the mask.
12. The method of claim 11, wherein the removing the portion of the energy transducer materials not protected by the mask comprises ion milling the portion of the energy transducer materials not protected by the mask.
13. The method of claim 10, wherein the shaping the pole materials comprises removing portions of the pole materials at a preselected angle.
14. The method of claim 13:
wherein the removing portions of the pole materials at the preselected angle comprises performing an etching process on the portions of the pole material at the preselected angle, and
wherein the etching process is selected from the group consisting of an ion milling process and a reactive ion etching process.
15. The method of claim 14, wherein the removing portions of the pole materials at the preselected angle further comprises rotating the pole material during the etching process.
16. The method of claim 10, wherein the trapezoidal shape comprises an isosceles trapezoid.
17. The method of claim 16:
wherein the isosceles trapezoid comprises a leading parallel side and a trailing parallel side, wherein the leading parallel side is parallel to the trailing parallel side,
wherein a length of the leading parallel side is greater than a length of the trailing parallel side, and
wherein the energy transducer abuts the trailing parallel side.
18. The method of claim 10, wherein a shape of the pole at the trailing edge comprises an isosceles trapezoid having a base angle of about 40 to about 80 degrees, wherein the base angle is relative to a leading parallel side of the isosceles trapezoid having a length greater than a trailing parallel side of the isosceles trapezoid.
19. The method of claim 10, wherein a shape of the pole at the trailing edge comprises an isosceles trapezoid having a base angle of about 60 degrees, wherein the base angle is relative to a leading parallel side of the isosceles trapezoid having a length greater than a trailing parallel side of the isosceles trapezoid.
20. The method of claim 10, wherein the energy transducer comprises a spin torque oscillator.
21. The method of claim 10, wherein the energy transducer comprises a component selected from the group consisting of a near field optical transducer and a waveguide.
22. The method of claim 10, wherein the depositing of the ferromagnetic material for the pole further comprises encapsulating the pole material.
23. The method of claim 10, wherein the preselected shape of the energy transducer at a bottom surface of the energy transducer comprises about a shape selected from the group consisting of a rectangular shape and a triangular shape.
US13/271,555 2011-10-12 2011-10-12 Systems and methods for providing a pole pedestal for microwave assisted magnetic recording Active 2031-11-30 US8456967B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/271,555 US8456967B1 (en) 2011-10-12 2011-10-12 Systems and methods for providing a pole pedestal for microwave assisted magnetic recording

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/271,555 US8456967B1 (en) 2011-10-12 2011-10-12 Systems and methods for providing a pole pedestal for microwave assisted magnetic recording

Publications (1)

Publication Number Publication Date
US8456967B1 true US8456967B1 (en) 2013-06-04

Family

ID=48484325

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/271,555 Active 2031-11-30 US8456967B1 (en) 2011-10-12 2011-10-12 Systems and methods for providing a pole pedestal for microwave assisted magnetic recording

Country Status (1)

Country Link
US (1) US8456967B1 (en)

Cited By (139)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130065086A1 (en) * 2011-09-12 2013-03-14 Kabushiki Kaisha Toshiba Reproducing head with spin-torque oscillator, and magnetic recording and reproducing apparatus
US20130114384A1 (en) * 2009-02-04 2013-05-09 HGST Netherlands B.V. Microwave-assisted magnetic recording device and method of formation thereof
US8717705B1 (en) * 2012-12-21 2014-05-06 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus including the same
US8830628B1 (en) 2009-02-23 2014-09-09 Western Digital (Fremont), Llc Method and system for providing a perpendicular magnetic recording head
US8879207B1 (en) 2011-12-20 2014-11-04 Western Digital (Fremont), Llc Method for providing a side shield for a magnetic recording transducer using an air bridge
US8883017B1 (en) 2013-03-12 2014-11-11 Western Digital (Fremont), Llc Method and system for providing a read transducer having seamless interfaces
US8917581B1 (en) 2013-12-18 2014-12-23 Western Digital Technologies, Inc. Self-anneal process for a near field transducer and chimney in a hard disk drive assembly
US8923102B1 (en) 2013-07-16 2014-12-30 Western Digital (Fremont), Llc Optical grating coupling for interferometric waveguides in heat assisted magnetic recording heads
US8947985B1 (en) 2013-07-16 2015-02-03 Western Digital (Fremont), Llc Heat assisted magnetic recording transducers having a recessed pole
US8953422B1 (en) 2014-06-10 2015-02-10 Western Digital (Fremont), Llc Near field transducer using dielectric waveguide core with fine ridge feature
US8958272B1 (en) 2014-06-10 2015-02-17 Western Digital (Fremont), Llc Interfering near field transducer for energy assisted magnetic recording
US8971160B1 (en) 2013-12-19 2015-03-03 Western Digital (Fremont), Llc Near field transducer with high refractive index pin for heat assisted magnetic recording
US8970988B1 (en) 2013-12-31 2015-03-03 Western Digital (Fremont), Llc Electric gaps and method for making electric gaps for multiple sensor arrays
US8976635B1 (en) 2014-06-10 2015-03-10 Western Digital (Fremont), Llc Near field transducer driven by a transverse electric waveguide for energy assisted magnetic recording
US8982508B1 (en) 2011-10-31 2015-03-17 Western Digital (Fremont), Llc Method for providing a side shield for a magnetic recording transducer
US8980109B1 (en) 2012-12-11 2015-03-17 Western Digital (Fremont), Llc Method for providing a magnetic recording transducer using a combined main pole and side shield CMP for a wraparound shield scheme
US8984740B1 (en) 2012-11-30 2015-03-24 Western Digital (Fremont), Llc Process for providing a magnetic recording transducer having a smooth magnetic seed layer
US8988812B1 (en) 2013-11-27 2015-03-24 Western Digital (Fremont), Llc Multi-sensor array configuration for a two-dimensional magnetic recording (TDMR) operation
US8988825B1 (en) 2014-02-28 2015-03-24 Western Digital (Fremont, LLC Method for fabricating a magnetic writer having half-side shields
US8993217B1 (en) 2013-04-04 2015-03-31 Western Digital (Fremont), Llc Double exposure technique for high resolution disk imaging
US8995087B1 (en) 2006-11-29 2015-03-31 Western Digital (Fremont), Llc Perpendicular magnetic recording write head having a wrap around shield
US9001465B1 (en) 2014-04-16 2015-04-07 HGST Netherlands B.V. Microwave-assisted magnetic recording head
US8997832B1 (en) 2010-11-23 2015-04-07 Western Digital (Fremont), Llc Method of fabricating micrometer scale components
US9001467B1 (en) 2014-03-05 2015-04-07 Western Digital (Fremont), Llc Method for fabricating side shields in a magnetic writer
US9001628B1 (en) 2013-12-16 2015-04-07 Western Digital (Fremont), Llc Assistant waveguides for evaluating main waveguide coupling efficiency and diode laser alignment tolerances for hard disk
US20150098150A1 (en) * 2013-10-03 2015-04-09 HGST Netherlands B.V. Magnetic write head having spin torque oscillator that is self aligned with write pole
US9007879B1 (en) 2014-06-10 2015-04-14 Western Digital (Fremont), Llc Interfering near field transducer having a wide metal bar feature for energy assisted magnetic recording
US9007719B1 (en) 2013-10-23 2015-04-14 Western Digital (Fremont), Llc Systems and methods for using double mask techniques to achieve very small features
US9007725B1 (en) 2014-10-07 2015-04-14 Western Digital (Fremont), Llc Sensor with positive coupling between dual ferromagnetic free layer laminates
US9013836B1 (en) 2013-04-02 2015-04-21 Western Digital (Fremont), Llc Method and system for providing an antiferromagnetically coupled return pole
US20150131184A1 (en) * 2013-11-08 2015-05-14 HGST Netherlands B.V. Tapered write head for mamr
US9042208B1 (en) 2013-03-11 2015-05-26 Western Digital Technologies, Inc. Disk drive measuring fly height by applying a bias voltage to an electrically insulated write component of a head
US9042058B1 (en) 2013-10-17 2015-05-26 Western Digital Technologies, Inc. Shield designed for middle shields in a multiple sensor array
US9042052B1 (en) 2014-06-23 2015-05-26 Western Digital (Fremont), Llc Magnetic writer having a partially shunted coil
US9042057B1 (en) 2013-01-09 2015-05-26 Western Digital (Fremont), Llc Methods for providing magnetic storage elements with high magneto-resistance using Heusler alloys
US9042051B2 (en) 2013-08-15 2015-05-26 Western Digital (Fremont), Llc Gradient write gap for perpendicular magnetic recording writer
US9053735B1 (en) 2014-06-20 2015-06-09 Western Digital (Fremont), Llc Method for fabricating a magnetic writer using a full-film metal planarization
US9064507B1 (en) 2009-07-31 2015-06-23 Western Digital (Fremont), Llc Magnetic etch-stop layer for magnetoresistive read heads
US9065043B1 (en) 2012-06-29 2015-06-23 Western Digital (Fremont), Llc Tunnel magnetoresistance read head with narrow shield-to-shield spacing
US9064527B1 (en) 2013-04-12 2015-06-23 Western Digital (Fremont), Llc High order tapered waveguide for use in a heat assisted magnetic recording head
US9064528B1 (en) 2013-05-17 2015-06-23 Western Digital Technologies, Inc. Interferometric waveguide usable in shingled heat assisted magnetic recording in the absence of a near-field transducer
US9070381B1 (en) 2013-04-12 2015-06-30 Western Digital (Fremont), Llc Magnetic recording read transducer having a laminated free layer
US9082423B1 (en) 2013-12-18 2015-07-14 Western Digital (Fremont), Llc Magnetic recording write transducer having an improved trailing surface profile
US9087527B1 (en) 2014-10-28 2015-07-21 Western Digital (Fremont), Llc Apparatus and method for middle shield connection in magnetic recording transducers
US9087534B1 (en) 2011-12-20 2015-07-21 Western Digital (Fremont), Llc Method and system for providing a read transducer having soft and hard magnetic bias structures
US9093639B2 (en) 2012-02-21 2015-07-28 Western Digital (Fremont), Llc Methods for manufacturing a magnetoresistive structure utilizing heating and cooling
US9104107B1 (en) 2013-04-03 2015-08-11 Western Digital (Fremont), Llc DUV photoresist process
US9111550B1 (en) 2014-12-04 2015-08-18 Western Digital (Fremont), Llc Write transducer having a magnetic buffer layer spaced between a side shield and a write pole by non-magnetic layers
US9111558B1 (en) 2014-03-14 2015-08-18 Western Digital (Fremont), Llc System and method of diffractive focusing of light in a waveguide
US9111564B1 (en) 2013-04-02 2015-08-18 Western Digital (Fremont), Llc Magnetic recording writer having a main pole with multiple flare angles
US9123362B1 (en) 2011-03-22 2015-09-01 Western Digital (Fremont), Llc Methods for assembling an electrically assisted magnetic recording (EAMR) head
US9123359B1 (en) 2010-12-22 2015-09-01 Western Digital (Fremont), Llc Magnetic recording transducer with sputtered antiferromagnetic coupling trilayer between plated ferromagnetic shields and method of fabrication
US9123358B1 (en) 2012-06-11 2015-09-01 Western Digital (Fremont), Llc Conformal high moment side shield seed layer for perpendicular magnetic recording writer
US9123374B1 (en) 2015-02-12 2015-09-01 Western Digital (Fremont), Llc Heat assisted magnetic recording writer having an integrated polarization rotation plate
US9135937B1 (en) 2014-05-09 2015-09-15 Western Digital (Fremont), Llc Current modulation on laser diode for energy assisted magnetic recording transducer
US9135930B1 (en) 2014-03-06 2015-09-15 Western Digital (Fremont), Llc Method for fabricating a magnetic write pole using vacuum deposition
US9142233B1 (en) 2014-02-28 2015-09-22 Western Digital (Fremont), Llc Heat assisted magnetic recording writer having a recessed pole
US9147404B1 (en) 2015-03-31 2015-09-29 Western Digital (Fremont), Llc Method and system for providing a read transducer having a dual free layer
US9147408B1 (en) 2013-12-19 2015-09-29 Western Digital (Fremont), Llc Heated AFM layer deposition and cooling process for TMR magnetic recording sensor with high pinning field
US9153255B1 (en) 2014-03-05 2015-10-06 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having an asymmetric gap and shields
US9183854B2 (en) 2014-02-24 2015-11-10 Western Digital (Fremont), Llc Method to make interferometric taper waveguide for HAMR light delivery
US9190079B1 (en) 2014-09-22 2015-11-17 Western Digital (Fremont), Llc Magnetic write pole having engineered radius of curvature and chisel angle profiles
US9190085B1 (en) 2014-03-12 2015-11-17 Western Digital (Fremont), Llc Waveguide with reflective grating for localized energy intensity
US9194692B1 (en) 2013-12-06 2015-11-24 Western Digital (Fremont), Llc Systems and methods for using white light interferometry to measure undercut of a bi-layer structure
US9202480B2 (en) 2009-10-14 2015-12-01 Western Digital (Fremont), LLC. Double patterning hard mask for damascene perpendicular magnetic recording (PMR) writer
US9202493B1 (en) 2014-02-28 2015-12-01 Western Digital (Fremont), Llc Method of making an ultra-sharp tip mode converter for a HAMR head
US9214165B1 (en) 2014-12-18 2015-12-15 Western Digital (Fremont), Llc Magnetic writer having a gradient in saturation magnetization of the shields
US9213322B1 (en) 2012-08-16 2015-12-15 Western Digital (Fremont), Llc Methods for providing run to run process control using a dynamic tuner
US9214169B1 (en) 2014-06-20 2015-12-15 Western Digital (Fremont), Llc Magnetic recording read transducer having a laminated free layer
US9214172B2 (en) 2013-10-23 2015-12-15 Western Digital (Fremont), Llc Method of manufacturing a magnetic read head
US9230565B1 (en) 2014-06-24 2016-01-05 Western Digital (Fremont), Llc Magnetic shield for magnetic recording head
US9236560B1 (en) 2014-12-08 2016-01-12 Western Digital (Fremont), Llc Spin transfer torque tunneling magnetoresistive device having a laminated free layer with perpendicular magnetic anisotropy
US9245543B1 (en) 2010-06-25 2016-01-26 Western Digital (Fremont), Llc Method for providing an energy assisted magnetic recording head having a laser integrally mounted to the slider
US9245545B1 (en) 2013-04-12 2016-01-26 Wester Digital (Fremont), Llc Short yoke length coils for magnetic heads in disk drives
US9245562B1 (en) 2015-03-30 2016-01-26 Western Digital (Fremont), Llc Magnetic recording writer with a composite main pole
US9251813B1 (en) 2009-04-19 2016-02-02 Western Digital (Fremont), Llc Method of making a magnetic recording head
US9263067B1 (en) 2013-05-29 2016-02-16 Western Digital (Fremont), Llc Process for making PMR writer with constant side wall angle
US9263071B1 (en) 2015-03-31 2016-02-16 Western Digital (Fremont), Llc Flat NFT for heat assisted magnetic recording
US9269382B1 (en) 2012-06-29 2016-02-23 Western Digital (Fremont), Llc Method and system for providing a read transducer having improved pinning of the pinned layer at higher recording densities
US9275657B1 (en) 2013-08-14 2016-03-01 Western Digital (Fremont), Llc Process for making PMR writer with non-conformal side gaps
US9280990B1 (en) 2013-12-11 2016-03-08 Western Digital (Fremont), Llc Method for fabricating a magnetic writer using multiple etches
US9287494B1 (en) 2013-06-28 2016-03-15 Western Digital (Fremont), Llc Magnetic tunnel junction (MTJ) with a magnesium oxide tunnel barrier
US9286919B1 (en) 2014-12-17 2016-03-15 Western Digital (Fremont), Llc Magnetic writer having a dual side gap
US9305583B1 (en) 2014-02-18 2016-04-05 Western Digital (Fremont), Llc Method for fabricating a magnetic writer using multiple etches of damascene materials
US9312064B1 (en) 2015-03-02 2016-04-12 Western Digital (Fremont), Llc Method to fabricate a magnetic head including ion milling of read gap using dual layer hard mask
US9318130B1 (en) 2013-07-02 2016-04-19 Western Digital (Fremont), Llc Method to fabricate tunneling magnetic recording heads with extended pinned layer
US9336814B1 (en) 2013-03-12 2016-05-10 Western Digital (Fremont), Llc Inverse tapered waveguide for use in a heat assisted magnetic recording head
US9343087B1 (en) 2014-12-21 2016-05-17 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having half shields
US9343098B1 (en) 2013-08-23 2016-05-17 Western Digital (Fremont), Llc Method for providing a heat assisted magnetic recording transducer having protective pads
US9343086B1 (en) 2013-09-11 2016-05-17 Western Digital (Fremont), Llc Magnetic recording write transducer having an improved sidewall angle profile
US9349392B1 (en) 2012-05-24 2016-05-24 Western Digital (Fremont), Llc Methods for improving adhesion on dielectric substrates
US9349394B1 (en) 2013-10-18 2016-05-24 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having a gradient side gap
US9355655B1 (en) * 2015-08-04 2016-05-31 HGST Netherlands B.V. Magnetic capping layer structure for a spin torque oscillator
US9355654B1 (en) 2012-12-21 2016-05-31 Western Digital Technologies, Inc. Spin torque oscillator for microwave assisted magnetic recording with increased damping
US9361913B1 (en) 2013-06-03 2016-06-07 Western Digital (Fremont), Llc Recording read heads with a multi-layer AFM layer methods and apparatuses
US9361914B1 (en) 2014-06-18 2016-06-07 Western Digital (Fremont), Llc Magnetic sensor with thin capping layer
US9368134B1 (en) 2010-12-16 2016-06-14 Western Digital (Fremont), Llc Method and system for providing an antiferromagnetically coupled writer
US9384763B1 (en) 2015-03-26 2016-07-05 Western Digital (Fremont), Llc Dual free layer magnetic reader having a rear bias structure including a soft bias layer
US9384765B1 (en) 2015-09-24 2016-07-05 Western Digital (Fremont), Llc Method and system for providing a HAMR writer having improved optical efficiency
US9390733B2 (en) * 2013-10-10 2016-07-12 HGST Netherlans B.V. Microwave-assisted magnetic recording (MAMR) head with an inclined and recessed main pole structure
US9396743B1 (en) 2014-02-28 2016-07-19 Western Digital (Fremont), Llc Systems and methods for controlling soft bias thickness for tunnel magnetoresistance readers
US9396742B1 (en) 2012-11-30 2016-07-19 Western Digital (Fremont), Llc Magnetoresistive sensor for a magnetic storage system read head, and fabrication method thereof
US9406331B1 (en) 2013-06-17 2016-08-02 Western Digital (Fremont), Llc Method for making ultra-narrow read sensor and read transducer device resulting therefrom
US9424866B1 (en) 2015-09-24 2016-08-23 Western Digital (Fremont), Llc Heat assisted magnetic recording write apparatus having a dielectric gap
US9431047B1 (en) 2013-05-01 2016-08-30 Western Digital (Fremont), Llc Method for providing an improved AFM reader shield
US9431038B1 (en) 2015-06-29 2016-08-30 Western Digital (Fremont), Llc Method for fabricating a magnetic write pole having an improved sidewall angle profile
US9431031B1 (en) 2015-03-24 2016-08-30 Western Digital (Fremont), Llc System and method for magnetic transducers having multiple sensors and AFC shields
US9431032B1 (en) 2013-08-14 2016-08-30 Western Digital (Fremont), Llc Electrical connection arrangement for a multiple sensor array usable in two-dimensional magnetic recording
US9431039B1 (en) 2013-05-21 2016-08-30 Western Digital (Fremont), Llc Multiple sensor array usable in two-dimensional magnetic recording
US9437251B1 (en) 2014-12-22 2016-09-06 Western Digital (Fremont), Llc Apparatus and method having TDMR reader to reader shunts
US9443541B1 (en) 2015-03-24 2016-09-13 Western Digital (Fremont), Llc Magnetic writer having a gradient in saturation magnetization of the shields and return pole
US9441938B1 (en) 2013-10-08 2016-09-13 Western Digital (Fremont), Llc Test structures for measuring near field transducer disc length
US9449625B1 (en) 2014-12-24 2016-09-20 Western Digital (Fremont), Llc Heat assisted magnetic recording head having a plurality of diffusion barrier layers
US9449621B1 (en) 2015-03-26 2016-09-20 Western Digital (Fremont), Llc Dual free layer magnetic reader having a rear bias structure having a high aspect ratio
US9472216B1 (en) 2015-09-23 2016-10-18 Western Digital (Fremont), Llc Differential dual free layer magnetic reader
US9484051B1 (en) 2015-11-09 2016-11-01 The Provost, Fellows, Foundation Scholars and the other members of Board, of the College of the Holy and Undivided Trinity of Queen Elizabeth near Dublin Method and system for reducing undesirable reflections in a HAMR write apparatus
US9508372B1 (en) 2015-06-03 2016-11-29 Western Digital (Fremont), Llc Shingle magnetic writer having a low sidewall angle pole
US9508363B1 (en) 2014-06-17 2016-11-29 Western Digital (Fremont), Llc Method for fabricating a magnetic write pole having a leading edge bevel
US9508365B1 (en) 2015-06-24 2016-11-29 Western Digital (Fremont), LLC. Magnetic reader having a crystal decoupling structure
US9530443B1 (en) 2015-06-25 2016-12-27 Western Digital (Fremont), Llc Method for fabricating a magnetic recording device having a high aspect ratio structure
US9564150B1 (en) 2015-11-24 2017-02-07 Western Digital (Fremont), Llc Magnetic read apparatus having an improved read sensor isolation circuit
US9595273B1 (en) 2015-09-30 2017-03-14 Western Digital (Fremont), Llc Shingle magnetic writer having nonconformal shields
US9646639B2 (en) 2015-06-26 2017-05-09 Western Digital (Fremont), Llc Heat assisted magnetic recording writer having integrated polarization rotation waveguides
US9666214B1 (en) 2015-09-23 2017-05-30 Western Digital (Fremont), Llc Free layer magnetic reader that may have a reduced shield-to-shield spacing
US9721595B1 (en) 2014-12-04 2017-08-01 Western Digital (Fremont), Llc Method for providing a storage device
US9740805B1 (en) 2015-12-01 2017-08-22 Western Digital (Fremont), Llc Method and system for detecting hotspots for photolithographically-defined devices
US9741366B1 (en) 2014-12-18 2017-08-22 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having a gradient in saturation magnetization of the shields
US9754611B1 (en) 2015-11-30 2017-09-05 Western Digital (Fremont), Llc Magnetic recording write apparatus having a stepped conformal trailing shield
US9767831B1 (en) 2015-12-01 2017-09-19 Western Digital (Fremont), Llc Magnetic writer having convex trailing surface pole and conformal write gap
US9786301B1 (en) 2014-12-02 2017-10-10 Western Digital (Fremont), Llc Apparatuses and methods for providing thin shields in a multiple sensor array
US9799351B1 (en) 2015-11-30 2017-10-24 Western Digital (Fremont), Llc Short yoke length writer having assist coils
US9812155B1 (en) 2015-11-23 2017-11-07 Western Digital (Fremont), Llc Method and system for fabricating high junction angle read sensors
US9842615B1 (en) 2015-06-26 2017-12-12 Western Digital (Fremont), Llc Magnetic reader having a nonmagnetic insertion layer for the pinning layer
US9858951B1 (en) 2015-12-01 2018-01-02 Western Digital (Fremont), Llc Method for providing a multilayer AFM layer in a read sensor
US9881638B1 (en) 2014-12-17 2018-01-30 Western Digital (Fremont), Llc Method for providing a near-field transducer (NFT) for a heat assisted magnetic recording (HAMR) device
US9934811B1 (en) 2014-03-07 2018-04-03 Western Digital (Fremont), Llc Methods for controlling stray fields of magnetic features using magneto-elastic anisotropy
US9953670B1 (en) 2015-11-10 2018-04-24 Western Digital (Fremont), Llc Method and system for providing a HAMR writer including a multi-mode interference device
US10037770B1 (en) 2015-11-12 2018-07-31 Western Digital (Fremont), Llc Method for providing a magnetic recording write apparatus having a seamless pole
US10074387B1 (en) 2014-12-21 2018-09-11 Western Digital (Fremont), Llc Method and system for providing a read transducer having symmetric antiferromagnetically coupled shields

Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080304176A1 (en) 2007-06-07 2008-12-11 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20090059418A1 (en) 2007-09-05 2009-03-05 Kabushiki Kaisha Toshiba Magnetic head and disk drive with high-frequency assisted writing
US20090059423A1 (en) 2007-09-04 2009-03-05 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20090080106A1 (en) 2007-09-25 2009-03-26 Kabushiki Kaisha Toshiba Magnetic head and magnetic recording device
US20090080105A1 (en) 2007-09-25 2009-03-26 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording device
US20090080120A1 (en) 2007-09-25 2009-03-26 Kabushiki Kaisha Toshiba Magnetic head and magnetic recording device
US20090201614A1 (en) 2008-02-13 2009-08-13 Kabushiki Kaisha Toshiba Spin-torque oscillator, magnetic head including the spin-torque oscillator, and magnetic recording and reproducing apparatus
US20090225465A1 (en) 2007-09-11 2009-09-10 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US7589600B2 (en) 2006-10-31 2009-09-15 Seagate Technology Llc Spin oscillator device
US7616412B2 (en) 2006-07-21 2009-11-10 Carnegie Melon University Perpendicular spin-torque-driven magnetic oscillator
US20090310254A1 (en) 2008-06-17 2009-12-17 Kabushiki Kaisha Toshiba Magnetic recording medium and magnetic recording/reproduction apparatus using the same
US20090316303A1 (en) 2008-06-19 2009-12-24 Kabushiki Kaisha Toshiba Magnetic head assembly
US20090316304A1 (en) 2008-06-19 2009-12-24 Kabushiki Kaisha Toshiba Magnetic head assembly and magnetic recording apparatus
US20100007996A1 (en) 2008-06-19 2010-01-14 Kabushiki Kaisha Toshiba Magnetic head assembly and magnetic recording/reproducing apparatus
US20100007992A1 (en) 2008-07-11 2010-01-14 Kabushiki Kaisha Toshiba Magnetic head assembly and magnetic recording apparatus
US20100027161A1 (en) 2008-07-31 2010-02-04 Kabushiki Kaisha Toshiba Magnetic recording apparatus
US20100027158A1 (en) 2008-07-31 2010-02-04 Kabushiki Kaisha Toshiba Magnetic head for high-frequency field assist recording and magnetic recording apparatus using magnetic head for high-frequency field assist recording
US20100033881A1 (en) 2008-08-07 2010-02-11 Hitachi Global Storage Technologies Netherlands B.V. Magnetic field sensing system using spin-torque diode effect
US20100053795A1 (en) 2008-08-29 2010-03-04 Kabushiki Kaisha Toshiba Magnetic recording and reproducing apparatus having a magnetic read head with a spin-torque oscillator
US7678475B2 (en) 2006-05-05 2010-03-16 Slavin Andrei N Spin-torque devices
US20100073806A1 (en) 2008-09-25 2010-03-25 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20100079919A1 (en) 2008-09-30 2010-04-01 Kabushiki Kaisha Toshiba Spin-torque oscillator, a magnetic sensor and a magnetic recording system
US20100110592A1 (en) 2008-11-06 2010-05-06 Kabushiki Kaisha Toshiba Spin torque oscillator, magnetic recording head, magnetic head assembly and magnetic recording apparatus
US20100134922A1 (en) 2008-11-28 2010-06-03 Kabushiki Kaisha Toshiba Magnetic recording head, magnetic head assembly, magnetic recording apparatus, and magnetic recording method
US20100142088A1 (en) 2008-10-06 2010-06-10 Kabushiki Kaisha Toshiba Spin torque oscillator, magnetic recording head, magnetic head assembly and magnetic recording apparatus
US20100195247A1 (en) 2009-02-04 2010-08-05 Masafumi Mochizuki Microwave-assisted magnetic recording device and method of formation thereof
US20100220415A1 (en) 2007-08-22 2010-09-02 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US7791829B2 (en) 2007-09-05 2010-09-07 Kabushiki Kaisha Toshiba Apparatus for assisting write operation using high frequency magnetic field in disk drive
US20100232053A1 (en) 2009-03-13 2010-09-16 Kabushiki Kaisha Toshiba Method and apparatus for controlling head with spin-torque oscillator in a disk drive
US20110007431A1 (en) 2009-06-25 2011-01-13 Hitachi Global Storage Technologies Netherlands .B. V. Spin torque oscillator sensor enhanced by magnetic anisotropy
US20110018647A1 (en) 2009-07-23 2011-01-27 Samsung Electronics Co., Ltd. Oscillators using magnetic domain wall and methods of operating the same
US20110019305A1 (en) 2009-07-27 2011-01-27 Suess Dieter Magnetic storage device
US20110038080A1 (en) 2009-08-17 2011-02-17 Hitachi Global Storage Technology Netherlands B.V. Perpendicular magnetic recording write head with spin torque oscillator for fast switching of write pole magnetization
US20110038081A1 (en) 2009-08-17 2011-02-17 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular magnetic recording system with spin torque oscillator and control circuitry for fast switching of write pole magnetization
US7965464B2 (en) * 2008-11-20 2011-06-21 Seagate Technology Llc Heat-assisted magnetic recording with shaped magnetic and thermal fields
US8289818B2 (en) * 2008-12-31 2012-10-16 Infinitum Solutions, Inc. Magneto-optic write-head characterization using the recording medium as a transducer layer

Patent Citations (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7678475B2 (en) 2006-05-05 2010-03-16 Slavin Andrei N Spin-torque devices
US7616412B2 (en) 2006-07-21 2009-11-10 Carnegie Melon University Perpendicular spin-torque-driven magnetic oscillator
US7589600B2 (en) 2006-10-31 2009-09-15 Seagate Technology Llc Spin oscillator device
US20080304176A1 (en) 2007-06-07 2008-12-11 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20100220415A1 (en) 2007-08-22 2010-09-02 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20090059423A1 (en) 2007-09-04 2009-03-05 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US8139322B2 (en) * 2007-09-04 2012-03-20 Kabushiki Kaisha Toshiba Magnetic recording head with protruding spin torque oscillator
US20090059418A1 (en) 2007-09-05 2009-03-05 Kabushiki Kaisha Toshiba Magnetic head and disk drive with high-frequency assisted writing
US7791829B2 (en) 2007-09-05 2010-09-07 Kabushiki Kaisha Toshiba Apparatus for assisting write operation using high frequency magnetic field in disk drive
US20090225465A1 (en) 2007-09-11 2009-09-10 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20090080120A1 (en) 2007-09-25 2009-03-26 Kabushiki Kaisha Toshiba Magnetic head and magnetic recording device
US8154825B2 (en) * 2007-09-25 2012-04-10 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording device
US20090080106A1 (en) 2007-09-25 2009-03-26 Kabushiki Kaisha Toshiba Magnetic head and magnetic recording device
US20090080105A1 (en) 2007-09-25 2009-03-26 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording device
US20090201614A1 (en) 2008-02-13 2009-08-13 Kabushiki Kaisha Toshiba Spin-torque oscillator, magnetic head including the spin-torque oscillator, and magnetic recording and reproducing apparatus
US20090310254A1 (en) 2008-06-17 2009-12-17 Kabushiki Kaisha Toshiba Magnetic recording medium and magnetic recording/reproduction apparatus using the same
US20100007996A1 (en) 2008-06-19 2010-01-14 Kabushiki Kaisha Toshiba Magnetic head assembly and magnetic recording/reproducing apparatus
US20090316303A1 (en) 2008-06-19 2009-12-24 Kabushiki Kaisha Toshiba Magnetic head assembly
US20090316304A1 (en) 2008-06-19 2009-12-24 Kabushiki Kaisha Toshiba Magnetic head assembly and magnetic recording apparatus
US20100007992A1 (en) 2008-07-11 2010-01-14 Kabushiki Kaisha Toshiba Magnetic head assembly and magnetic recording apparatus
US20100027158A1 (en) 2008-07-31 2010-02-04 Kabushiki Kaisha Toshiba Magnetic head for high-frequency field assist recording and magnetic recording apparatus using magnetic head for high-frequency field assist recording
US20100027161A1 (en) 2008-07-31 2010-02-04 Kabushiki Kaisha Toshiba Magnetic recording apparatus
US20100033881A1 (en) 2008-08-07 2010-02-11 Hitachi Global Storage Technologies Netherlands B.V. Magnetic field sensing system using spin-torque diode effect
US20100053795A1 (en) 2008-08-29 2010-03-04 Kabushiki Kaisha Toshiba Magnetic recording and reproducing apparatus having a magnetic read head with a spin-torque oscillator
US20100073806A1 (en) 2008-09-25 2010-03-25 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus
US20100079919A1 (en) 2008-09-30 2010-04-01 Kabushiki Kaisha Toshiba Spin-torque oscillator, a magnetic sensor and a magnetic recording system
US20100142088A1 (en) 2008-10-06 2010-06-10 Kabushiki Kaisha Toshiba Spin torque oscillator, magnetic recording head, magnetic head assembly and magnetic recording apparatus
US20100110592A1 (en) 2008-11-06 2010-05-06 Kabushiki Kaisha Toshiba Spin torque oscillator, magnetic recording head, magnetic head assembly and magnetic recording apparatus
US8159769B2 (en) * 2008-11-20 2012-04-17 Seagate Technology Llc Heat-assisted magnetic recording with shaped magnetic and thermal fields to minimize transition curvature
US7965464B2 (en) * 2008-11-20 2011-06-21 Seagate Technology Llc Heat-assisted magnetic recording with shaped magnetic and thermal fields
US20100134922A1 (en) 2008-11-28 2010-06-03 Kabushiki Kaisha Toshiba Magnetic recording head, magnetic head assembly, magnetic recording apparatus, and magnetic recording method
US8289818B2 (en) * 2008-12-31 2012-10-16 Infinitum Solutions, Inc. Magneto-optic write-head characterization using the recording medium as a transducer layer
US20100195247A1 (en) 2009-02-04 2010-08-05 Masafumi Mochizuki Microwave-assisted magnetic recording device and method of formation thereof
US20100232053A1 (en) 2009-03-13 2010-09-16 Kabushiki Kaisha Toshiba Method and apparatus for controlling head with spin-torque oscillator in a disk drive
US20110007431A1 (en) 2009-06-25 2011-01-13 Hitachi Global Storage Technologies Netherlands .B. V. Spin torque oscillator sensor enhanced by magnetic anisotropy
US20110018647A1 (en) 2009-07-23 2011-01-27 Samsung Electronics Co., Ltd. Oscillators using magnetic domain wall and methods of operating the same
US20110019305A1 (en) 2009-07-27 2011-01-27 Suess Dieter Magnetic storage device
US20110038081A1 (en) 2009-08-17 2011-02-17 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular magnetic recording system with spin torque oscillator and control circuitry for fast switching of write pole magnetization
US20110038080A1 (en) 2009-08-17 2011-02-17 Hitachi Global Storage Technology Netherlands B.V. Perpendicular magnetic recording write head with spin torque oscillator for fast switching of write pole magnetization

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Xiaochun Zhu et al., "Bias-Field-Free Microwave Oscillator Driven by Perpendicularly Polarized Spin Current", IEEE Transactions on Magnetics, vol. 42, No. 10, Oct. 2006, pp. 2670-2672.
Yuhui Tang, et al., "Narrow Track Confinement by AC Field Generation Layer in Microwave Assisted Magnetic Recording", IEEE Transactions on Magnetics, vol. 44, No. 11, Nov. 2008, pp. 3376-3379.

Cited By (158)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8995087B1 (en) 2006-11-29 2015-03-31 Western Digital (Fremont), Llc Perpendicular magnetic recording write head having a wrap around shield
US9305586B2 (en) * 2009-02-04 2016-04-05 HGST Netherlands B.V. Microwave-assisted magnetic recording device and method of formation thereof
US20130114384A1 (en) * 2009-02-04 2013-05-09 HGST Netherlands B.V. Microwave-assisted magnetic recording device and method of formation thereof
US8830628B1 (en) 2009-02-23 2014-09-09 Western Digital (Fremont), Llc Method and system for providing a perpendicular magnetic recording head
US9251813B1 (en) 2009-04-19 2016-02-02 Western Digital (Fremont), Llc Method of making a magnetic recording head
US9064507B1 (en) 2009-07-31 2015-06-23 Western Digital (Fremont), Llc Magnetic etch-stop layer for magnetoresistive read heads
US9202480B2 (en) 2009-10-14 2015-12-01 Western Digital (Fremont), LLC. Double patterning hard mask for damascene perpendicular magnetic recording (PMR) writer
US9245543B1 (en) 2010-06-25 2016-01-26 Western Digital (Fremont), Llc Method for providing an energy assisted magnetic recording head having a laser integrally mounted to the slider
US9159345B1 (en) 2010-11-23 2015-10-13 Western Digital (Fremont), Llc Micrometer scale components
US8997832B1 (en) 2010-11-23 2015-04-07 Western Digital (Fremont), Llc Method of fabricating micrometer scale components
US9672847B2 (en) 2010-11-23 2017-06-06 Western Digital (Fremont), Llc Micrometer scale components
US9368134B1 (en) 2010-12-16 2016-06-14 Western Digital (Fremont), Llc Method and system for providing an antiferromagnetically coupled writer
US9123359B1 (en) 2010-12-22 2015-09-01 Western Digital (Fremont), Llc Magnetic recording transducer with sputtered antiferromagnetic coupling trilayer between plated ferromagnetic shields and method of fabrication
US9123362B1 (en) 2011-03-22 2015-09-01 Western Digital (Fremont), Llc Methods for assembling an electrically assisted magnetic recording (EAMR) head
US8755153B2 (en) * 2011-09-12 2014-06-17 Kabushiki Kaisha Toshiba Reproducing head with spin-torque oscillator, and magnetic recording and reproducing apparatus
US20130065086A1 (en) * 2011-09-12 2013-03-14 Kabushiki Kaisha Toshiba Reproducing head with spin-torque oscillator, and magnetic recording and reproducing apparatus
US8982508B1 (en) 2011-10-31 2015-03-17 Western Digital (Fremont), Llc Method for providing a side shield for a magnetic recording transducer
US9087534B1 (en) 2011-12-20 2015-07-21 Western Digital (Fremont), Llc Method and system for providing a read transducer having soft and hard magnetic bias structures
US8879207B1 (en) 2011-12-20 2014-11-04 Western Digital (Fremont), Llc Method for providing a side shield for a magnetic recording transducer using an air bridge
US9093639B2 (en) 2012-02-21 2015-07-28 Western Digital (Fremont), Llc Methods for manufacturing a magnetoresistive structure utilizing heating and cooling
US9349392B1 (en) 2012-05-24 2016-05-24 Western Digital (Fremont), Llc Methods for improving adhesion on dielectric substrates
US9940950B2 (en) 2012-05-24 2018-04-10 Western Digital (Fremont), Llc Methods for improving adhesion on dielectric substrates
US9123358B1 (en) 2012-06-11 2015-09-01 Western Digital (Fremont), Llc Conformal high moment side shield seed layer for perpendicular magnetic recording writer
US9412400B2 (en) 2012-06-29 2016-08-09 Western Digital (Fremont), Llc Tunnel magnetoresistance read head with narrow shield-to-shield spacing
US9065043B1 (en) 2012-06-29 2015-06-23 Western Digital (Fremont), Llc Tunnel magnetoresistance read head with narrow shield-to-shield spacing
US9269382B1 (en) 2012-06-29 2016-02-23 Western Digital (Fremont), Llc Method and system for providing a read transducer having improved pinning of the pinned layer at higher recording densities
US9213322B1 (en) 2012-08-16 2015-12-15 Western Digital (Fremont), Llc Methods for providing run to run process control using a dynamic tuner
US8984740B1 (en) 2012-11-30 2015-03-24 Western Digital (Fremont), Llc Process for providing a magnetic recording transducer having a smooth magnetic seed layer
US9396742B1 (en) 2012-11-30 2016-07-19 Western Digital (Fremont), Llc Magnetoresistive sensor for a magnetic storage system read head, and fabrication method thereof
US8980109B1 (en) 2012-12-11 2015-03-17 Western Digital (Fremont), Llc Method for providing a magnetic recording transducer using a combined main pole and side shield CMP for a wraparound shield scheme
US8717705B1 (en) * 2012-12-21 2014-05-06 Kabushiki Kaisha Toshiba Magnetic recording head and magnetic recording apparatus including the same
US9355654B1 (en) 2012-12-21 2016-05-31 Western Digital Technologies, Inc. Spin torque oscillator for microwave assisted magnetic recording with increased damping
US9042057B1 (en) 2013-01-09 2015-05-26 Western Digital (Fremont), Llc Methods for providing magnetic storage elements with high magneto-resistance using Heusler alloys
US9042208B1 (en) 2013-03-11 2015-05-26 Western Digital Technologies, Inc. Disk drive measuring fly height by applying a bias voltage to an electrically insulated write component of a head
US8883017B1 (en) 2013-03-12 2014-11-11 Western Digital (Fremont), Llc Method and system for providing a read transducer having seamless interfaces
US9336814B1 (en) 2013-03-12 2016-05-10 Western Digital (Fremont), Llc Inverse tapered waveguide for use in a heat assisted magnetic recording head
US9111564B1 (en) 2013-04-02 2015-08-18 Western Digital (Fremont), Llc Magnetic recording writer having a main pole with multiple flare angles
US9013836B1 (en) 2013-04-02 2015-04-21 Western Digital (Fremont), Llc Method and system for providing an antiferromagnetically coupled return pole
US9104107B1 (en) 2013-04-03 2015-08-11 Western Digital (Fremont), Llc DUV photoresist process
US8993217B1 (en) 2013-04-04 2015-03-31 Western Digital (Fremont), Llc Double exposure technique for high resolution disk imaging
US9245545B1 (en) 2013-04-12 2016-01-26 Wester Digital (Fremont), Llc Short yoke length coils for magnetic heads in disk drives
US9064527B1 (en) 2013-04-12 2015-06-23 Western Digital (Fremont), Llc High order tapered waveguide for use in a heat assisted magnetic recording head
US9070381B1 (en) 2013-04-12 2015-06-30 Western Digital (Fremont), Llc Magnetic recording read transducer having a laminated free layer
US9431047B1 (en) 2013-05-01 2016-08-30 Western Digital (Fremont), Llc Method for providing an improved AFM reader shield
US9064528B1 (en) 2013-05-17 2015-06-23 Western Digital Technologies, Inc. Interferometric waveguide usable in shingled heat assisted magnetic recording in the absence of a near-field transducer
US9431039B1 (en) 2013-05-21 2016-08-30 Western Digital (Fremont), Llc Multiple sensor array usable in two-dimensional magnetic recording
US9263067B1 (en) 2013-05-29 2016-02-16 Western Digital (Fremont), Llc Process for making PMR writer with constant side wall angle
US9361913B1 (en) 2013-06-03 2016-06-07 Western Digital (Fremont), Llc Recording read heads with a multi-layer AFM layer methods and apparatuses
US9406331B1 (en) 2013-06-17 2016-08-02 Western Digital (Fremont), Llc Method for making ultra-narrow read sensor and read transducer device resulting therefrom
US9287494B1 (en) 2013-06-28 2016-03-15 Western Digital (Fremont), Llc Magnetic tunnel junction (MTJ) with a magnesium oxide tunnel barrier
US9318130B1 (en) 2013-07-02 2016-04-19 Western Digital (Fremont), Llc Method to fabricate tunneling magnetic recording heads with extended pinned layer
US8947985B1 (en) 2013-07-16 2015-02-03 Western Digital (Fremont), Llc Heat assisted magnetic recording transducers having a recessed pole
US8923102B1 (en) 2013-07-16 2014-12-30 Western Digital (Fremont), Llc Optical grating coupling for interferometric waveguides in heat assisted magnetic recording heads
US9275657B1 (en) 2013-08-14 2016-03-01 Western Digital (Fremont), Llc Process for making PMR writer with non-conformal side gaps
US9431032B1 (en) 2013-08-14 2016-08-30 Western Digital (Fremont), Llc Electrical connection arrangement for a multiple sensor array usable in two-dimensional magnetic recording
US9042051B2 (en) 2013-08-15 2015-05-26 Western Digital (Fremont), Llc Gradient write gap for perpendicular magnetic recording writer
US9343098B1 (en) 2013-08-23 2016-05-17 Western Digital (Fremont), Llc Method for providing a heat assisted magnetic recording transducer having protective pads
US9343086B1 (en) 2013-09-11 2016-05-17 Western Digital (Fremont), Llc Magnetic recording write transducer having an improved sidewall angle profile
US20150098150A1 (en) * 2013-10-03 2015-04-09 HGST Netherlands B.V. Magnetic write head having spin torque oscillator that is self aligned with write pole
US9047894B2 (en) * 2013-10-03 2015-06-02 HGST Netherlands B.V. Magnetic write head having spin torque oscillator that is self aligned with write pole
US9441938B1 (en) 2013-10-08 2016-09-13 Western Digital (Fremont), Llc Test structures for measuring near field transducer disc length
US9390733B2 (en) * 2013-10-10 2016-07-12 HGST Netherlans B.V. Microwave-assisted magnetic recording (MAMR) head with an inclined and recessed main pole structure
US9042058B1 (en) 2013-10-17 2015-05-26 Western Digital Technologies, Inc. Shield designed for middle shields in a multiple sensor array
US9349394B1 (en) 2013-10-18 2016-05-24 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having a gradient side gap
US9007719B1 (en) 2013-10-23 2015-04-14 Western Digital (Fremont), Llc Systems and methods for using double mask techniques to achieve very small features
US9830936B2 (en) 2013-10-23 2017-11-28 Western Digital (Fremont), Llc Magnetic read head with antiferromagentic layer
US9214172B2 (en) 2013-10-23 2015-12-15 Western Digital (Fremont), Llc Method of manufacturing a magnetic read head
US9135933B2 (en) * 2013-11-08 2015-09-15 HGST Netherlands B.V. Tapered write head for MAMR
US20150131184A1 (en) * 2013-11-08 2015-05-14 HGST Netherlands B.V. Tapered write head for mamr
US8988812B1 (en) 2013-11-27 2015-03-24 Western Digital (Fremont), Llc Multi-sensor array configuration for a two-dimensional magnetic recording (TDMR) operation
US9194692B1 (en) 2013-12-06 2015-11-24 Western Digital (Fremont), Llc Systems and methods for using white light interferometry to measure undercut of a bi-layer structure
US9280990B1 (en) 2013-12-11 2016-03-08 Western Digital (Fremont), Llc Method for fabricating a magnetic writer using multiple etches
US9001628B1 (en) 2013-12-16 2015-04-07 Western Digital (Fremont), Llc Assistant waveguides for evaluating main waveguide coupling efficiency and diode laser alignment tolerances for hard disk
US8917581B1 (en) 2013-12-18 2014-12-23 Western Digital Technologies, Inc. Self-anneal process for a near field transducer and chimney in a hard disk drive assembly
US9082423B1 (en) 2013-12-18 2015-07-14 Western Digital (Fremont), Llc Magnetic recording write transducer having an improved trailing surface profile
US9147408B1 (en) 2013-12-19 2015-09-29 Western Digital (Fremont), Llc Heated AFM layer deposition and cooling process for TMR magnetic recording sensor with high pinning field
US8971160B1 (en) 2013-12-19 2015-03-03 Western Digital (Fremont), Llc Near field transducer with high refractive index pin for heat assisted magnetic recording
US8970988B1 (en) 2013-12-31 2015-03-03 Western Digital (Fremont), Llc Electric gaps and method for making electric gaps for multiple sensor arrays
US9305583B1 (en) 2014-02-18 2016-04-05 Western Digital (Fremont), Llc Method for fabricating a magnetic writer using multiple etches of damascene materials
US9183854B2 (en) 2014-02-24 2015-11-10 Western Digital (Fremont), Llc Method to make interferometric taper waveguide for HAMR light delivery
US9396743B1 (en) 2014-02-28 2016-07-19 Western Digital (Fremont), Llc Systems and methods for controlling soft bias thickness for tunnel magnetoresistance readers
US9202493B1 (en) 2014-02-28 2015-12-01 Western Digital (Fremont), Llc Method of making an ultra-sharp tip mode converter for a HAMR head
US8988825B1 (en) 2014-02-28 2015-03-24 Western Digital (Fremont, LLC Method for fabricating a magnetic writer having half-side shields
US9142233B1 (en) 2014-02-28 2015-09-22 Western Digital (Fremont), Llc Heat assisted magnetic recording writer having a recessed pole
US9001467B1 (en) 2014-03-05 2015-04-07 Western Digital (Fremont), Llc Method for fabricating side shields in a magnetic writer
US9349393B2 (en) 2014-03-05 2016-05-24 Western Digital (Fremont), Llc Magnetic writer having an asymmetric gap and shields
US9153255B1 (en) 2014-03-05 2015-10-06 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having an asymmetric gap and shields
US9135930B1 (en) 2014-03-06 2015-09-15 Western Digital (Fremont), Llc Method for fabricating a magnetic write pole using vacuum deposition
US9934811B1 (en) 2014-03-07 2018-04-03 Western Digital (Fremont), Llc Methods for controlling stray fields of magnetic features using magneto-elastic anisotropy
US9190085B1 (en) 2014-03-12 2015-11-17 Western Digital (Fremont), Llc Waveguide with reflective grating for localized energy intensity
US9495984B2 (en) 2014-03-12 2016-11-15 Western Digital (Fremont), Llc Waveguide with reflective grating for localized energy intensity
US9111558B1 (en) 2014-03-14 2015-08-18 Western Digital (Fremont), Llc System and method of diffractive focusing of light in a waveguide
US9001465B1 (en) 2014-04-16 2015-04-07 HGST Netherlands B.V. Microwave-assisted magnetic recording head
US9135937B1 (en) 2014-05-09 2015-09-15 Western Digital (Fremont), Llc Current modulation on laser diode for energy assisted magnetic recording transducer
US8953422B1 (en) 2014-06-10 2015-02-10 Western Digital (Fremont), Llc Near field transducer using dielectric waveguide core with fine ridge feature
US8976635B1 (en) 2014-06-10 2015-03-10 Western Digital (Fremont), Llc Near field transducer driven by a transverse electric waveguide for energy assisted magnetic recording
US9311952B2 (en) 2014-06-10 2016-04-12 Western Digital (Fremont), Llc Interfering near field transducer for energy assisted magnetic recording
US9159346B1 (en) 2014-06-10 2015-10-13 Western Digital (Fremont), Llc Near field transducer using dielectric waveguide core with fine ridge feature
US8958272B1 (en) 2014-06-10 2015-02-17 Western Digital (Fremont), Llc Interfering near field transducer for energy assisted magnetic recording
US9007879B1 (en) 2014-06-10 2015-04-14 Western Digital (Fremont), Llc Interfering near field transducer having a wide metal bar feature for energy assisted magnetic recording
US9508363B1 (en) 2014-06-17 2016-11-29 Western Digital (Fremont), Llc Method for fabricating a magnetic write pole having a leading edge bevel
US9361914B1 (en) 2014-06-18 2016-06-07 Western Digital (Fremont), Llc Magnetic sensor with thin capping layer
US9214169B1 (en) 2014-06-20 2015-12-15 Western Digital (Fremont), Llc Magnetic recording read transducer having a laminated free layer
US9053735B1 (en) 2014-06-20 2015-06-09 Western Digital (Fremont), Llc Method for fabricating a magnetic writer using a full-film metal planarization
US9042052B1 (en) 2014-06-23 2015-05-26 Western Digital (Fremont), Llc Magnetic writer having a partially shunted coil
US9230565B1 (en) 2014-06-24 2016-01-05 Western Digital (Fremont), Llc Magnetic shield for magnetic recording head
US9190079B1 (en) 2014-09-22 2015-11-17 Western Digital (Fremont), Llc Magnetic write pole having engineered radius of curvature and chisel angle profiles
US9007725B1 (en) 2014-10-07 2015-04-14 Western Digital (Fremont), Llc Sensor with positive coupling between dual ferromagnetic free layer laminates
US9087527B1 (en) 2014-10-28 2015-07-21 Western Digital (Fremont), Llc Apparatus and method for middle shield connection in magnetic recording transducers
US9786301B1 (en) 2014-12-02 2017-10-10 Western Digital (Fremont), Llc Apparatuses and methods for providing thin shields in a multiple sensor array
US9111550B1 (en) 2014-12-04 2015-08-18 Western Digital (Fremont), Llc Write transducer having a magnetic buffer layer spaced between a side shield and a write pole by non-magnetic layers
US9721595B1 (en) 2014-12-04 2017-08-01 Western Digital (Fremont), Llc Method for providing a storage device
US9236560B1 (en) 2014-12-08 2016-01-12 Western Digital (Fremont), Llc Spin transfer torque tunneling magnetoresistive device having a laminated free layer with perpendicular magnetic anisotropy
US9705072B2 (en) 2014-12-08 2017-07-11 Western Digital (Fremont), Llc Spin transfer torque tunneling magnetoresistive device having a laminated free layer with perpendicular magnetic anisotropy
US9286919B1 (en) 2014-12-17 2016-03-15 Western Digital (Fremont), Llc Magnetic writer having a dual side gap
US9881638B1 (en) 2014-12-17 2018-01-30 Western Digital (Fremont), Llc Method for providing a near-field transducer (NFT) for a heat assisted magnetic recording (HAMR) device
US9741366B1 (en) 2014-12-18 2017-08-22 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having a gradient in saturation magnetization of the shields
US9214165B1 (en) 2014-12-18 2015-12-15 Western Digital (Fremont), Llc Magnetic writer having a gradient in saturation magnetization of the shields
US10074387B1 (en) 2014-12-21 2018-09-11 Western Digital (Fremont), Llc Method and system for providing a read transducer having symmetric antiferromagnetically coupled shields
US9343087B1 (en) 2014-12-21 2016-05-17 Western Digital (Fremont), Llc Method for fabricating a magnetic writer having half shields
US9437251B1 (en) 2014-12-22 2016-09-06 Western Digital (Fremont), Llc Apparatus and method having TDMR reader to reader shunts
US9449625B1 (en) 2014-12-24 2016-09-20 Western Digital (Fremont), Llc Heat assisted magnetic recording head having a plurality of diffusion barrier layers
US9123374B1 (en) 2015-02-12 2015-09-01 Western Digital (Fremont), Llc Heat assisted magnetic recording writer having an integrated polarization rotation plate
US9312064B1 (en) 2015-03-02 2016-04-12 Western Digital (Fremont), Llc Method to fabricate a magnetic head including ion milling of read gap using dual layer hard mask
US9754613B2 (en) 2015-03-24 2017-09-05 Western Digital (Fremont), Llc Method for AFC shields for multiple sensor magnetic transducers and magnetic transducers having multiple sensors and AFC shields
US9431031B1 (en) 2015-03-24 2016-08-30 Western Digital (Fremont), Llc System and method for magnetic transducers having multiple sensors and AFC shields
US9443541B1 (en) 2015-03-24 2016-09-13 Western Digital (Fremont), Llc Magnetic writer having a gradient in saturation magnetization of the shields and return pole
US9449621B1 (en) 2015-03-26 2016-09-20 Western Digital (Fremont), Llc Dual free layer magnetic reader having a rear bias structure having a high aspect ratio
US9922672B1 (en) 2015-03-26 2018-03-20 Western Digital (Fremont), Llc Dual free layer magnetic reader having a rear bias structure having a high aspect ratio
US9384763B1 (en) 2015-03-26 2016-07-05 Western Digital (Fremont), Llc Dual free layer magnetic reader having a rear bias structure including a soft bias layer
US9245562B1 (en) 2015-03-30 2016-01-26 Western Digital (Fremont), Llc Magnetic recording writer with a composite main pole
US9263071B1 (en) 2015-03-31 2016-02-16 Western Digital (Fremont), Llc Flat NFT for heat assisted magnetic recording
US9147404B1 (en) 2015-03-31 2015-09-29 Western Digital (Fremont), Llc Method and system for providing a read transducer having a dual free layer
US9508372B1 (en) 2015-06-03 2016-11-29 Western Digital (Fremont), Llc Shingle magnetic writer having a low sidewall angle pole
US9508365B1 (en) 2015-06-24 2016-11-29 Western Digital (Fremont), LLC. Magnetic reader having a crystal decoupling structure
US9530443B1 (en) 2015-06-25 2016-12-27 Western Digital (Fremont), Llc Method for fabricating a magnetic recording device having a high aspect ratio structure
US9646639B2 (en) 2015-06-26 2017-05-09 Western Digital (Fremont), Llc Heat assisted magnetic recording writer having integrated polarization rotation waveguides
US10242700B2 (en) 2015-06-26 2019-03-26 Western Digital (Fremont), Llc Magnetic reader having a nonmagnetic insertion layer for the pinning layer
US9842615B1 (en) 2015-06-26 2017-12-12 Western Digital (Fremont), Llc Magnetic reader having a nonmagnetic insertion layer for the pinning layer
US9431038B1 (en) 2015-06-29 2016-08-30 Western Digital (Fremont), Llc Method for fabricating a magnetic write pole having an improved sidewall angle profile
US9355655B1 (en) * 2015-08-04 2016-05-31 HGST Netherlands B.V. Magnetic capping layer structure for a spin torque oscillator
US9472216B1 (en) 2015-09-23 2016-10-18 Western Digital (Fremont), Llc Differential dual free layer magnetic reader
US9666214B1 (en) 2015-09-23 2017-05-30 Western Digital (Fremont), Llc Free layer magnetic reader that may have a reduced shield-to-shield spacing
US9384765B1 (en) 2015-09-24 2016-07-05 Western Digital (Fremont), Llc Method and system for providing a HAMR writer having improved optical efficiency
US9424866B1 (en) 2015-09-24 2016-08-23 Western Digital (Fremont), Llc Heat assisted magnetic recording write apparatus having a dielectric gap
US9595273B1 (en) 2015-09-30 2017-03-14 Western Digital (Fremont), Llc Shingle magnetic writer having nonconformal shields
US9484051B1 (en) 2015-11-09 2016-11-01 The Provost, Fellows, Foundation Scholars and the other members of Board, of the College of the Holy and Undivided Trinity of Queen Elizabeth near Dublin Method and system for reducing undesirable reflections in a HAMR write apparatus
US9953670B1 (en) 2015-11-10 2018-04-24 Western Digital (Fremont), Llc Method and system for providing a HAMR writer including a multi-mode interference device
US10037770B1 (en) 2015-11-12 2018-07-31 Western Digital (Fremont), Llc Method for providing a magnetic recording write apparatus having a seamless pole
US9812155B1 (en) 2015-11-23 2017-11-07 Western Digital (Fremont), Llc Method and system for fabricating high junction angle read sensors
US9564150B1 (en) 2015-11-24 2017-02-07 Western Digital (Fremont), Llc Magnetic read apparatus having an improved read sensor isolation circuit
US10121495B2 (en) 2015-11-30 2018-11-06 Western Digital (Fremont), Llc Magnetic recording write apparatus having a stepped conformal trailing shield
US9799351B1 (en) 2015-11-30 2017-10-24 Western Digital (Fremont), Llc Short yoke length writer having assist coils
US9754611B1 (en) 2015-11-30 2017-09-05 Western Digital (Fremont), Llc Magnetic recording write apparatus having a stepped conformal trailing shield
US9858951B1 (en) 2015-12-01 2018-01-02 Western Digital (Fremont), Llc Method for providing a multilayer AFM layer in a read sensor
US9997177B2 (en) 2015-12-01 2018-06-12 Western Digital (Fremont), Llc Magnetic writer having convex trailing surface pole and conformal write gap
US9740805B1 (en) 2015-12-01 2017-08-22 Western Digital (Fremont), Llc Method and system for detecting hotspots for photolithographically-defined devices
US9767831B1 (en) 2015-12-01 2017-09-19 Western Digital (Fremont), Llc Magnetic writer having convex trailing surface pole and conformal write gap

Similar Documents

Publication Publication Date Title
US7120988B2 (en) Method for forming a write head having air bearing surface (ABS)
US8171618B1 (en) Tunable pole trim processes for fabricating trapezoidal perpendicular magnetic recording (PMR) write poles
US7031121B2 (en) Perpendicular recording magnetic head with a write shield magnetically coupled to a first pole piece
US8238056B2 (en) Perpendicular shield pole writer with tapered main pole and tapered non-magnetic top shaping layer
US8081397B2 (en) Magnetic head assembly and magnetic recording apparatus
JP5596904B2 (en) Composite shield structure and a perpendicular magnetic recording head
US7159302B2 (en) Method for manufacturing a perpendicular write head
US7777988B2 (en) Perpendicular write head with tapered main pole
US7239478B1 (en) Write element for perpendicular recording in a data storage system
US20050219747A1 (en) Trailing edge taper design and method for making a perpendicular write head with shielding
US8125732B2 (en) Tapered PMR write pole with straight side wall portion
US7008550B2 (en) Method for forming a read transducer by ion milling and chemical mechanical polishing to eliminate nonuniformity near the MR sensor
JP4260002B2 (en) Magnetic head and its production method and a magnetic recording and reproducing apparatus
US7911735B1 (en) Perpendicular magnetic recording head utilizing a nonmagnetic underlayer layer
US8018678B1 (en) Method for simultaneous electronic lapping guide (ELG) and perpendicular magnetic recording (PMR) pole formation
US5815343A (en) Magnetic recording medium, process for producing the same and magnetic recording system
US20140175050A1 (en) Method for providing a magnetic recording transducer including a wraparound shield and a rectangular pole
US6490125B1 (en) Thin film write head with improved yoke to pole stitch
US8134802B2 (en) Writer and reader arrangements for shingled writing
US7024756B2 (en) Method of making a perpendicular recording magnetic head pole tip with an etchable adhesion CMP stop layer
US7726009B1 (en) Method of fabricating a perpendicular recording write head having a gap with two portions
US7142391B2 (en) Thin film head, producing method thereof and magnetic disk apparatus
US7343664B2 (en) Method of manufacturing a magnetic head with flux shaping layer
US5916423A (en) P1 notched write head with minimum overmilled p1 and p2
US7549213B2 (en) Method for independent trackwidth and wall angle control and hexagonal write head

Legal Events

Date Code Title Description
AS Assignment

Owner name: WESTERN DIGITAL (FREMONT), LLC, CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MALLARY, MICHAEL L.;REEL/FRAME:027049/0672

Effective date: 20111012

STCF Information on status: patent grant

Free format text: PATENTED CASE

AS Assignment

Owner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, IL

Free format text: SECURITY AGREEMENT;ASSIGNOR:WESTERN DIGITAL (FREMONT), LLC;REEL/FRAME:038710/0845

Effective date: 20160512

Owner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, IL

Free format text: SECURITY AGREEMENT;ASSIGNOR:WESTERN DIGITAL (FREMONT), LLC;REEL/FRAME:038744/0755

Effective date: 20160512

Owner name: U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGEN

Free format text: SECURITY AGREEMENT;ASSIGNOR:WESTERN DIGITAL (FREMONT), LLC;REEL/FRAME:038744/0675

Effective date: 20160512

FPAY Fee payment

Year of fee payment: 4

AS Assignment

Owner name: WESTERN DIGITAL (FREMONT), LLC, CALIFORNIA

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT;REEL/FRAME:045501/0158

Effective date: 20180227